Coating apparatus



De- 5, 1944 L. MEISTER COATING APPARATUS Filed Aug. 31, 1942 Imam/lkw LEE Meister @mmap Patented Dec. 5, 1944 UNITED STATES PATENT OFFICE COATING APPARATUS Leo Meister, Irvington, N. J.

V Application August 31, 1942, Serial No. 456,756 i rc1. sil- 39) (Granted under the act of March 3, 1883, as amended April 30, 1928; 370 0. G. 757) 5 Claims.

The invention described herein may be manufactured and used by or for the Government f or governmental purposes, without the payment to me of any royalty thereon.

This invention relates to coating machines such as are used to coat the inside of cup-shaped articles.

It is an object of this invention to provide a coating machine which permits the quick and easy application of a protective coating to the inside of a cup-shaped article, such as a detonator cup. This is accomplished by a pervious jacket orcap to which the coating substance is supplied by a simple pump. The pervious jacket closely lits the pump outlet or nozzle, which may be a wire screen or a perforated tube. The pump itself is a cylinder mounted to reciprocate in a cavity in a base or support. The piston is fixed in the cavity. Communication between the cylinder and a reservoir in the support is cut off by movement of the cylinder toward the piston. A spring in the cavity opposes such movement.

The specific nature of the invention as well as other objects and advantages thereof will clearly appear from a description of a preferred embodiment as shown in the accompanying drawing in which:

Fig. 1 of the drawing shows the coating machine.

Fig. 2 is a view in section substantially on line 2--2 of Fig. 1. In this figure, a cup-shaped article to be coated is shown in place over the nozzle.

Referringto the drawing in detail, a support 2 is shown having therein a cavity 4 which is preferably circular in cross-section. Cavity 4 and its contained pump may be duplicated to provide two units as shown in the drawing for two-handed operation, or as many more units as desired may be provided in one support or base.

A pump piston 6 is provided in cavity 4, as by being mounted on a head 8 which is threaded into the cavity. A pump cylinder I is reciprocably mounted in the cavity, engaging piston 6 for the pumping effect. Pump action is obtained a, plan view of by pushing cylinder I0 downward over piston 6.

against the bias of spring I2.

Cylinder Il) has a passage or wall opening I4 which registers with passageway I6 communieating with reservoir I8 which contains a coating substance such as lacquer, paint or the like. Reservoir I8 may be an inverted cup-shaped shell 20 covering a shallow basin 22 formed in support 2. A ller opening having a cap or plug 24 may be provided in shell 20.

Near the upper end of cylinder Ill is a check valve 26 consisting of a ball seated on the upper opening of the cylinder. The ball may movie away from the opening in a chamber 28 formed by end cap 30 over the end of the cylinder. Screwed into cap 30 is a nozzle which provides egress for the coat forming substance. The nozzle may be a nipple with a wire screen end on it, or it may be a closed end tube 32 as shown having a plurality of holes 34 through its wall. Covering the holes in the tube end is a porous, absorbent cap 36, preferably of felt or the like. An example of a cup-shaped article the inside of which is to be coated is shown at 36, Fig. 2. lIt will be noted that the absorbent cap is considerably shorter than the article to be coated. In fact the difference may be even greater than shown. An article may be effectively coated by an absorbent jacket only one fourth as long.

Operation-An article 38, the inside of which is to be coated, is placed over absorbent cap 36, and downward pressure is exerted. Cylinder I0 moves against the bias of spring I2 over piston 6. Passage I4 is moved out of communication with passageway I6 and is closed by piston 6. The coat-forming substance above the piston is forced upward through valve 26 into chamber 28, whence it passes through the nozzle and into the absorbent cap. Pressure is then released, and spring I2 forces the cylinder and article up- Ward.` As the cylinder rises, valve 26 closes, and when the cylinder has reached the upper limit of its stroke, the decreased pressure draws more of the coat-forming substance into the cylinder. As article 3B is pulled off, its inside surface is thoroughly coated with the substance saturating absorbent cap 36.

If desired, an adjustable collar 40 may be provided to permit regulation of the length of stroke of the cylinder.

I claim:

1. A coating machine comprising: a. support having a cavity therein, ahollow pump cylinder movably mounted in the cavity, a. reservoir having communication through the wall of the pump cylinder, said communication being cut loi by the pump cylinder on movement thereof to eject coating substance from the cylinder, and a nozzle on the cylinder through which the coating substance is ejected.

2. A coating machine comprising: a support having a cavity therein, a pump cylinder movably mounted in the cavity, a reservoir having communication with the pump cylinder, said communication being cut oi by movement of the cylinder to eject coating substance therefrom,t a. nozzle on the cylinder through which the coating substance is ejected, and a close tting porous jacket on the nozzle.

3. In combination, a support having a cavity therein, a pump piston mounted in the cavity, a hollow pump cylinder cooperable with the piston and reciprocable in the cavity, a reservoir for a coating substance, a passageway communicating with the cylinder and the reservoir, said passageway being blocked by the cylinder upon movement thereof to eject coating substance 4. The combination of claim 3, and a close tting porous cap on the nozzle.

5. A coating machine comprising a reservoir for a coating substance, a support for the reservoir having a cavity therein adjacent the reservoir, and a, coating supply conduit connecting said reservoir and cavity, a. spring backed hollow cylinder reciprocable in said cavity and having a port normally in registry with said conduit, and a stationary piston in said cavity and working in the cylinder and adapted to eject coating substance from the cylinder upon the downward movement thereof.

LEO MEISTER.

therefrom, and a. nozzle through which coating 15 I substance is ejected from the cylinder. 

